Has this become a problem again in version 4.1.16? I just built a SCO 507 VM and have this exact problem. It looks like it was fixed, but maybe returned. If I do a shutdown, it goes to safe to power off and I can end the VM fine. However, pressing a key to reboot or running the reboot command (or init 6) the system will shutdown fine, but Guru the second after.
Attaching log and png files.